IGCSE/GCSE/O & A Level/IB/University Student Forum

Qualification => Subject Doubts => IGCSE/ GCSE => Math => Topic started by: zara on May 30, 2009, 08:26:28 pm

Title: maths help...urgent!!
Post by: zara on May 30, 2009, 08:26:28 pm

hi all
@mods n admins
i cudnt find ne math related topic...so had to start a new topic...

@all
heres my doubt....i kno exams r ova but this is on behalf of summon hu hv their exam tom...so plz help..

An aircraft flies 400km from a point O on a bearing of 025(degrees) and then 700km on a bearing of 080(degrees) to arrive at B.
(a)How far north of O is B?
(b)How far east of O is B?
(c)Find the distance and bearing of B from O.

plz reply asap!!
Thanks in advance..

Title: Re: maths help...urgent!!
Post by: ramezamgad on May 30, 2009, 08:35:04 pm

a)485km
b)858km
c)986km 60.5 bearing

Title: Re: maths help...urgent!!
Post by: zara on May 30, 2009, 08:38:48 pm

Thanks but i want the explanation...the answers are their at the bak of the bk...but how??

plz draw the diagram wid necessary calculations and scan it up if u can...plzz..

Title: Re: maths help...urgent!!
Post by: ramezamgad on May 30, 2009, 08:40:53 pm

i resolved the 400km and 700km into the vertical and horizontal components separately
the vertical comp. of 400 is 400sin65
horizontal is 400cos65
the same to 700 km
in the end i drew a triangle with the final results to find the hypotenuse and the angle

Title: Re: maths help...urgent!!
Post by: zara on May 30, 2009, 08:57:14 pm

Thanks alot!!!
y didnt i got this??its so simple...
maybe cz im so full wid chem that i cant at all concentrate at ne other subject....

neways Thanks alot!!!!

Title: Re: maths help...urgent!!
Post by: ramezamgad on May 30, 2009, 09:03:36 pm

u r welcum